This is an externally thread gate valve use for sewage treatment facilities. The inside is paint with 385μm epoxy resin paint for waterworks as standard.
The 7.5K valve is inspect by the Japan Water Association as standard.
As it is an externally thread type, foreign matter in the fluid does not interfere with the threaded part of the valve stem, allowing for smooth opening and closing.
It demonstrates high performance when fully open and closed.